The SPEEDWAY 3-piece 1-1/8 in. to 3- 3/4 in. exhaust muffler tail pipe expander will cover most pipe diameters you can quickly and easily straighten out clamp dent in mufflers and tailpipes with a simple wrench turn you can expand pipe for exhaust system repair and installations. Perfect for expanding pipes, plumbing, tail pipes, duct work and so much more. This 3-piece exhaust muffler tail pipe expander will aid in roll bar modifications and heavy-duty construction designed with drop forged, heat treated steel and comes in a blow mold case.